Справочник Пользователя для Renesas 70
Chapter 5 Detailed Applications
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When the I flag before issuing a service call is 1
When the I flag before issuing a service call is 0
Service call issued
service call processing
I flag
IPL
1
4
system.IPL
system.IPL
1
0
4
1
4
Service call issued
service call processing
I flag
IPL
0
4
system.IPL
system.IPL
0
0
4
Task or
Handler
Handler
Task or
Handler
Handler
Task or
Handler
Handler
Task or
Handler
Handler
4
Figure 5.13 Interrupt control in a System Call that can be Issued from a Task-independent
, the interrupt enable flag and IPL change in a service call. For this reason, if you want to disable interrupts in a
user application, Renesas does not recommend using the method for manipulating the interrupt disable flag and
IPL to disable the interrupts.
user application, Renesas does not recommend using the method for manipulating the interrupt disable flag and
IPL to disable the interrupts.
The following two methods for interrupt control are recommended:
1. Modify the interrupt control register (SFR) for the interrupt you want to be disabled.
2. Use service calls loc_cpu and unl_cpu.
The interrupts that can be controlled by the loc_cpu service call are only the kernel(OS-dependent)
interrupt. Use method 1 to control the non-kernel(OS-independent) interrupts.
interrupt. Use method 1 to control the non-kernel(OS-independent) interrupts.